Pore size control of mesoporous silicas from mixtures of sodium silicate and TEOS

Liu, J., Yang, Q., Zhao, X. S. and Zhang, L. (2007) Pore size control of mesoporous silicas from mixtures of sodium silicate and TEOS. Microporous and Mesoporous Materials, 106 1-3: 62-67. doi:10.1016/j.micromeso.2007.02.045


Author Liu, J.
Yang, Q.
Zhao, X. S.
Zhang, L.
Title Pore size control of mesoporous silicas from mixtures of sodium silicate and TEOS
Journal name Microporous and Mesoporous Materials   Check publisher's open access policy
ISSN 1387-1811
Publication date 2007-11-01
Sub-type Article (original research)
DOI 10.1016/j.micromeso.2007.02.045
Volume 106
Issue 1-3
Start page 62
End page 67
Total pages 6
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Mesoporous silicas with large and tunable pore size (10-16 nm) were successfully synthesized from mixtures of sodium silicate (Na2SiO3) and tetraethoxysilane (TEOS) in acetic acid/sodium acetate buffer solution (pH 4.4, HAc-NaAc) using poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (EO20PO70EO20, denoted as P123) as template, in which TEOS acts both as a swelling agent and a silica source. Highly ordered 2-D hexagonal and mesostructured cellular foam structure with large pore size could be obtained using sodium silicate and TEOS as silica source, respectively. By adjusting the initial molar ratio of TEOS/(Na2SiO3+TEOS) from 0 to 0.5, the pore sizes of the final ordered 2-D hexagonal mesoporous silicas could be precisely tuned from 10 to 15 nm. The large pore size (15 nm) of the material was attributed to the slow hydrolysis and polymerization rate of TEOS in the buffer solution. The presence of ethanol in the synthesis system also has strong effects on the mesostructure and pore size of the materials. © 2007 Elsevier Inc. All rights reserved.
Keyword Mesoporous Materials
Large pore size
Sodium silicate
Buffer solution
Mesocellular Foam
Temperature
Copolymer
Triblock
Sba-15
Mechanism
Expanders
Design
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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